Air tube for pneumatic bicycle tires



FIG. 1 is a perspective view of an air tube for pneumatic bicycle tires incorporating our new design, it being understood that the exterior pattern repeats circumferentially throughout the outer circumference.

FIG. 2 is an elevational view of one end of the design as shown in FIG. 1; and,

FIG. 3 an elevational view of one side of the design as shown in FIG. 1.

In the drawings, the broken line showing of a valve stem depicts environmental subject matter and forms no part of the claim. 

The ornamental design for an air tube for pneumatic bicycle tires, as shown and described. 